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WIP: HDR-aware adaptive quantization

ifb requested to merge ifb/x264:hdropt into master

Use --hdr-opt to enable quantization to adjust for the perceptual difference between bt709 and st2084/arib-std-b67. Bits are moved to brighter areas of the image at the expense of darker areas.

This approach is based on the perceptual luma scheme described in ITU-T Rec. H, Supplement 15.

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